Festo CPX Electronic Manual page 195

C. General information on parametrizing
1
Sensor signal
2
Logical CPX signal
3
Change of edge
within the signal
extension time
Fig. C/2: Change of edge within the signal extension time
Festo P.BE−CPX−SYS−EN en 0503b
Method of operation
Signal states accepted as logical input signals usually remain
valid at least until the specified minimum signal duration has
expired. Change of edge within the minimum signal duration
are ignored (see Fig. C/2). Fixed debouncing times remain
effective.
Case 1: Change of edge within the signal extension
time
The logical CPX signal is supplied when the signal extension
time and, if applicable, the debouncing time has expired.
a) Rising edge
1
1
0
1
2
0
b) Falling edge
1
1
0
1
2
0
Expiry of the debouncing time
3
Expiry of the signal extension time
3
C−7